Absorbent article

Abstract

To provide an absorbent article capable of absorbing discharged liquid effectively.SOLUTION: An absorbent article includes: a length along a longitudinal direction; a length along a width direction orthogonal to the longitudinal direction; a front bodice region opposed to the abdominal part of a wearer; a back bodice region opposed to the back part of the wearer; a crotch region positioned between the front bodice region and the back bodice region, where an absorber is arranged; an exterior body for at least covering an outside and a non-skin surface side in a width direction of the crotch region of the absorber and the front bodice region; a locking member protruding from a width direction end part of the back bodice region, in which a hook tape of a hook-and-loop fastener is joined to the skin surface side; and a front patch having a joint region joined to the exterior body on the non-skin surface side of the front bodice region, a non-joint region extending in the longitudinal direction, which is not joined to the exterior body, and a convex member or a loop member with which the hook tape can be engaged repeatedly, which extends in the longitudinal direction and in which pleats whose central part protrudes on the non-skin surface side are added in the non-joint region.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an absorbent article. [Background technology]

[0002] As an example of an absorbent article, a tape-type diaper is known (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-068464 A Summary of the Invention [Problem to be solved by the invention]

[0004] A tape-type diaper is a type of diaper that is fixed around the wearer's waist by engaging a fastening tape with a front patch, and is easier to put on and take off than a pants-type diaper. However, if the engagement between the front patch and the fastening tape is not sufficient, the fastening tape may peel off from the front patch when pressure is applied to the waist. If the fastening tape peels off from the front patch, it becomes difficult to maintain the diaper on.

[0005] An object of the present invention is to provide an absorbent article that is easy to maintain when worn. [Means for solving the problem]

[0006] An absorbent article according to one aspect of the present invention comprises a length along a longitudinal direction, a length along a width direction perpendicular to the longitudinal direction, a front body region facing the abdomen of a wearer, a back body region facing the back of the wearer, a crotch region located between the front body region and the rear body region and in which an absorbent is disposed, an exterior body covering at least the outer side and non-skin-facing side of the crotch region and the front body region of the absorbent in the width direction, a fastening member protruding from the width direction end of the rear body region and having a hook tape of a hook-and-loop fastener joined to its skin-facing side, a joined region joined to the exterior body on the non-skin-facing side of the front body region, a non-jointed region extending in the longitudinal direction and not joined to the exterior body, and a front patch in the non-jointed region having a recessed material or loop member with which the hook tape can be repeatedly engaged, the hook tape being creased in a central portion thereof so as to be convex toward the non-skin-facing side. Effect of the Invention

[0007] According to the present invention, the wearing state can be easily maintained. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a diaper according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the diaper according to the embodiment. [Diagram 3] FIG. 3 is a cross-sectional view of the diaper according to the embodiment when not being worn, taken along the width direction at the center in the longitudinal direction. [Figure 4] FIG. 4 is a plan view of the diaper according to the embodiment in a stretched state, as viewed from the skin-facing side. [Diagram 5] FIG. 5 is a cross-sectional view of a front patch portion in the first embodiment. [Figure 6] FIG. 6 is a schematic diagram showing an example of a protrusion formed on the front patch in the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view of a front patch portion in the second embodiment. [Figure 8]FIG. 8 is a schematic diagram showing an example of a protrusion formed on the front patch in the second embodiment. [Figure 9] FIG. 9 is an enlarged view of the widthwise end portion of the rear body region of the diaper and the fastening member. [Figure 10] FIG. 10 is a cross-sectional view of a front patch portion in the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, absorbent articles according to embodiments of the present invention will be described with reference to the drawings. Note that the configurations of the following embodiments are merely examples, and the present invention is not limited to the configurations of these embodiments.

[0010] <First embodiment> In this embodiment, the longitudinal direction of a tape-type disposable diaper (an example of an "absorbent article" in the present application, hereinafter simply referred to as a "diaper") is the direction connecting the front body arranged opposite the wearer's abdomen and the rear body arranged opposite the wearer's back. Between the front body (one side in the longitudinal direction) and the rear body (the other side in the longitudinal direction) (the center in the longitudinal direction), a crotch portion arranged under the wearer's crotch (opposed to the crotch). In addition, when the diaper is worn by a wearer (hereinafter abbreviated as "worn state"), the side facing the wearer's skin (the inner side when worn) is the skin-facing side, and the opposite side to the skin-facing side (the outer side when worn) is the non-skin-facing side. Furthermore, the direction connecting the skin-facing side and the non-skin-facing side is the thickness direction, and the direction perpendicular to both the longitudinal direction and the thickness direction is the width direction. In addition, the view from the thickness direction is the planar view. A diaper has a length along a longitudinal direction corresponding to the front-to-back direction of a wearer and a length along a width direction perpendicular to the longitudinal direction, and is worn under the crotch of a wearer. In addition, terms related to directions used in this application mean directions corresponding to the front-to-back, left-to-right and right-to-left directions of a wearer when the diaper is worn. For example, the left-to-right direction in this application means a direction corresponding to the left-to-right directions of a wearer when the diaper is worn.

[0011] FIG. 1 is a perspective view of a diaper according to this embodiment. The diaper 1 according to this embodiment is for adults (for nursing care). The diaper 1 has a crotch region 1B, which is a region corresponding to the crotch covering the pubic area of ​​the wearer when worn, a front body region 1F, which is located in front of the crotch region 1B and corresponds to the waist of the wearer's abdomen, and a back body region 1R, which is located behind the crotch region 1B and corresponds to the waist of the wearer's back. The left and right edges of the back body region 1R are provided with fastening members 2L1, 2L2, 2R1, and 2R2, which have small hook portions densely arranged on the skin side of the wearer and function as hook carriers that hold hook tapes, which are hook fasteners that can be repeatedly attached by engaging the hook portions with loop members densely arranged on the non-skin side of a front patch 2F provided on the front body region 1F. When the hook tapes of the fastening members 2L1, 2L2, 2R1, and 2R2 are attached to the front patch 2F with the front body region 1F positioned on the wearer's abdomen and the rear body region 1R positioned on the wearer's back, the diaper 1 is fixed to the wearer's body in a state where it surrounds the wearer's waist circumference and thighs. Since the diaper 1 is fixed to the wearer's body in this manner, the wearer can freely change his or her body position while wearing the diaper 1. The non-skin facing sides of the fastening members 2L1, 2L2, 2R1, and 2R2 may be engageable with the hook tapes.

[0012] The hook tape is attached to the skin-facing side of the fastening members 2L1, 2L2, 2R1, 2R2 on the outer side in the width direction of the diaper 1 by applying an adhesive such as a hot melt adhesive. Hook portions, which are minute key-shaped structures made of resin, are densely arranged on the skin-facing side of the hook tape. When the diaper 1 is worn, the hook portions are engaged with a loop member or a concave recessed member provided on the non-skin-facing side of the front patch 2F, thereby allowing the diaper 1 to be fixed to the wearer's torso. In other words, the hook tape is a fastening tape whose skin-facing side functions as a hook-and-loop fastener.

[0013] The locking members 2L1, 2L2, 2R1, and 2R2 may be folded inward in the width direction when unused. By folding the locking members 2L1, 2L2, 2R1, and 2R2, the hook tape portion is not exposed to the outside of the diaper 1. The hook tape portion is provided with a minute key-shaped structure made of resin, and by folding the locking members 2L1, 2L2, 2R1, and 2R2 when unused, it is possible to prevent the key-shaped structure from being unexpectedly damaged and becoming difficult to engage with the front patch 2F.

[0014] In the diaper 1, an absorbent 6 capable of absorbing and retaining liquid is mainly disposed near the crotch region 1B. In addition, in order to prevent the formation of gaps between the diaper 1 and the wearer's skin that serve as a liquid outflow path, the diaper 1 is provided with leg gathers 3AL, 3AR at a portion along the wearer's leg circumference (thighs), and three-dimensional gathers 3BL, 3BR are provided on the inside of the leg gathers 3AL, 3AR in the width direction of the diaper 1, and a waist gather 3R is provided at a portion along the wearer's abdominal circumference. The leg gathers 3AL, 3AR, the three-dimensional gathers 3BL, 3BR, and the waist gathers 3R are in close contact with the wearer's skin by the elastic force of the elastic members. Therefore, the liquid discharged from the non-wearer is absorbed by the absorbent 6 without leaking from the diaper 1. Note that the elastic member may be a thread-like or strip-like rubber or the like.

[0015] FIG. 2 is an exploded perspective view of the diaper 1. FIG. 3 is a cross-sectional view of the diaper 1 cut in the width direction at the center in the longitudinal direction. FIG. 4 is a plan view of the diaper 1 in an extended state, viewed from the skin-facing side. The diaper 1 has a cover sheet 4 that forms an outer surface when worn. The cover sheet 4 is a sheet-like member having a substantially rectangular appearance with constrictions 4KL, 4KR at the portions corresponding to the long sides, and forms the exterior surface of the diaper 1. The constrictions 4KL, 4KR are provided at the portions where the wearer's thighs are located (leg surrounding portions 10L, 10R shown in FIG. 4). The cover sheet 4 is provided to reinforce the back sheet 5 described later and to improve the feel. For example, a nonwoven fabric made of a liquid-impermeable thermoplastic resin can be used as the material for the cover sheet 4 in order to suppress leakage of excrement. Examples of liquid-impermeable thermoplastic resins include polyethylene (PE) and polypropylene (PP). The cover sheet 4 is not limited to a single-layer structure, but may be a multi-layer structure having an inner cover sheet and an outer cover sheet.

[0016] The diaper 1 has a back sheet 5 (non-skin-facing sheet), an absorbent 6, and a top sheet 7 ("skin-facing portion"), which are laminated in this order on the skin-facing side of the cover sheet 4. The back sheet 5 has the same planar shape as the cover sheet 4. The back sheet 5 is a sheet-like member having a substantially rectangular appearance with constrictions 5KL, 5KR at the portions corresponding to the long sides, and is disposed on the skin-facing side of the cover sheet 4. The constrictions 5KL, 5KR are provided at the portions where the wearer's thighs are located (leg surrounding portions 10L, 10R shown in FIG. 4). The top sheet 7 is a sheet-like member having a substantially rectangular appearance, and the absorbent 6 is a mat-like member having a substantially hourglass-shaped appearance. The back sheet 5, the absorbent 6, and the top sheet 7 are laminated in this order on the cover sheet 4 with their longitudinal directions coinciding with the longitudinal direction of the cover sheet 4. The back sheet 5, like the cover sheet 4, is a sheet formed of a liquid-impermeable thermoplastic resin material to suppress leakage of discharged liquid. The back sheet 5 is preferably made of a material that is also moisture permeable in order to prevent the diaper from becoming stuffy when worn. The top sheet 7 is a sheet-like member that is placed on the wearer's skin side so as to cover the water-absorbing surface of the absorbent body 6. The top sheet 7 is water permeable in part or in whole. Therefore, when the diaper 1 is worn, the liquid discharged by the wearer passes through the top sheet 7 that may come into contact with the wearer's skin and enters the absorbent body 6, where it is absorbed. For example, woven fabric, nonwoven fabric, and porous film are used as the material for the top sheet 7. The top sheet 7 may be hydrophilic. The joining of the sheets includes adhesion with a hot melt adhesive, ultrasonic fusion, and the like.

[0017] The back sheet 5, absorbent body 6, and top sheet 7 all extend from the front body region 1F to the back body region 1R. Therefore, when the wearer's private parts are covered with the cover sheet 4 in which the back sheet 5, absorbent body 6, and top sheet 7 are laminated, both ends in the longitudinal direction of the back sheet 5, absorbent body 6, and top sheet 7 are located on the wearer's ventral side and back side. In other words, the wearer's private parts are covered by the absorbent body 6 from the wearer's ventral side to the back side. Therefore, whether the wearer is lying in a supine position or a prone position, the discharged liquid comes into contact with the absorbent body 6 via the top sheet 7.

[0018] In addition, the diaper 1 has elastic members 4SL, 4SR for forming the leg gathers 3AL, 3AR between the cover sheet 4 and the back sheet 5 so as to stretch in the longitudinal direction of the diaper 1. The elastic members 4SL, 4SR are provided in an appropriate number (three in this embodiment) determined according to the elastic force (contractile force) required in the design of the diaper 1. As shown in FIG. 4, the leg gathers 3AL, 3AR are arranged at both ends in the width direction of the crotch region 1B, including the leg surrounding portions 10L, 10R which are portions of the diaper 1 that follow the circumference of the legs of the wearer. The leg surrounding portions 10L, 10R are arranged at both ends in the width direction of the crotch region 1B, and the elastic members 4SL, 4SR are bonded to the leg surrounding portions 10L, 10R in a stretched state so as to extend in the longitudinal direction, thereby stretching the leg surrounding portions 10L, 10R in the longitudinal direction. The stretchable regions of the elastic members 4SL, 4SR become the leg gathers 3AL, 3AR. The elastic members 4SL, 4SR are an example of a first elastic member in the present disclosure.

[0019] The diaper 1 also has long, narrow, strip-like side sheets 8L, 8R. The side sheets 8L, 8R are liquid-impermeable sheets provided on the long sides of the top sheet 7. The side sheets 8L, 8R are arranged on the outer side of the widthwise center of the diaper 1. Like the cover sheet 4, the side sheets 8L, 8R have constrictions 8KL, 8KR at the locations where the wearer's thighs are located (leg-surrounding portions 10L, 10R shown in FIG. 4). The side sheets 8L, 8R have elastic members 8EL, 8ER for forming three-dimensional gathers 3BL, 3BR arranged in a stretched state along the longitudinal direction. When the diaper 1 is worn, the side sheets 8L, 8R are pulled in the longitudinal direction by the contractile force of the elastic members 8EL, 8ER and rise from the top sheet 7 toward the skin side, forming three-dimensional gathers 3BL, 3BR that are leakage-proof walls that prevent discharged liquid from leaking outward in the width direction.

[0020] The cover sheet 4 includes an elastic member 4C for preventing a gap from being formed between the diaper 1 and the wearer's abdominal circumference, which is located on the inner side of the elastic members 4SL and 4SR in the width direction of the diaper 1. The elastic member 4C is arranged in a curved shape extending outward in the width direction at both ends in the longitudinal direction. More specifically, the elastic member 4C is arranged wide in the front body region 1F and the back body region 1R, which are both ends in the longitudinal direction. The elastic member 4C is arranged narrow in the crotch region 1B, which corresponds to the crotch of the wearer when worn, curved on the inner side in the width direction, and arranged in a stretched state in the longitudinal direction so as to overlap the absorbent body 6 in the crotch region 1B in the thickness direction. The stretchable ends formed in the front body region 1F and the back body region 1R, i.e., the ends of the portions of the extension regions of the elastic member 4C that can exert a biasing force, do not overlap the absorbent body 6. The elastic member 4C is arranged according to the elastic force (contractile force) required for the design of the diaper 1. The elastic member 4C is an example of a second elastic member in the present disclosure.

[0021] Furthermore, the elastic member 9ER for forming the above-mentioned waist gather 3R is provided between the back sheet 5 and the top sheet 7 at a position further back than the end of the absorbent body 6. The elastic member 9ER is provided between the back sheet 5 and the top sheet 7 with its longitudinal direction, which is the stretch direction, oriented in the left-right direction of the diaper 1. Therefore, when the hook tapes 20 provided on the fastening members 2L1, 2L2, 2R1, 2R2, which are tapes provided on both the left and right sides of the elastic member 9ER, are attached to the front patch 2F on the abdominal side of the wearer, the elastic member 9ER exerts a contractile force to bring the diaper 1 into close contact with the wearer, and creates a gap between the diaper 1 and the wearer's abdominal circumference. Prevents the formation of

[0022] The absorbent body 6 has an absorbent core 6C and a core wrap sheet 6W that wraps the absorbent core 6C. In this embodiment, the absorbent core 6C is formed by laminating a plurality of absorbent mats. In this embodiment, the absorbent core 6C has an upper absorbent mat 6A arranged on the skin side and a lower absorbent mat 6B arranged on the non-skin side. The upper absorbent mat 6A is an absorbent mat that is located on the skin side of the wearer when worn, and has an hourglass shape with a narrowed part in the crotch region 1B when viewed from above. The upper absorbent mat 6A extends to the vicinity of the widthwise end of the absorbent body 6 near the longitudinal end. In contrast, the lower absorbent mat 6B is an absorbent mat that is located on the non-skin side of the wearer when worn, and has a rectangular shape when viewed from above. The lower absorbent mat 6B is arranged around the center of the width direction of the absorbent body 6, and its overall width is equal to or less than the narrowed part of the upper absorbent mat 6A. That is, the lower absorbent mat 6B is laminated with the upper absorbent mat 6A so that the lower absorbent mat 6B is entirely hidden by the upper absorbent mat 6A when viewed in plan from the skin-facing side.

[0023] The crotch region 1B is sandwiched between the wearer's legs, and thus compressive pressure is applied inward in the width direction. On the other hand, in the front body region 1F and the back body region 1R, the weight of the wearer is applied, and pressure is applied in the thickness direction of the absorbent core 6C. To cope with these pressures, the crotch region 1B of the absorbent core 6C is provided with a constriction. Furthermore, the upper layer absorbent mat 6A and the lower layer absorbent mat 6B are laminated to give the absorbent core 6C in the crotch region 1B a high basis weight. This prevents the absorbent core 6C from losing its shape inward in the width direction in the crotch region 1B. Also, in the front body region 1F and the back body region 1R, the width of the absorbent core 6C is widened to increase the area on which the weight is applied, thereby preventing the absorbent core 6C from losing its shape in the thickness direction. For this reason, it is preferable to make the absorbent core 6C approximately hourglass-shaped.

[0024] The absorbent core 6C is, for example, a hydrophilic polymer having a cross-linked structure capable of absorbing and retaining water, which is filled in the gaps between short fibers of cellulosic fibers such as pulp fibers, rayon fibers, or cotton fibers, or short fibers of synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate that have been hydrophilically treated. The absorbent core 6C has a structure that holds granular absorbent polymer such as cellulose acylate (cellulose ester) or cellulose ester (cellulose ester). Therefore, in the absorbent core 6C, the volumetric change of the absorbent resin before and after absorbing liquid basically occurs within the short fibers that hold the absorbent resin in the gaps. Therefore, when the absorbent core 6C is viewed as a whole, it can be said that the expansion rate of the thickness of the absorbent core 6C that has absorbed liquid is not as large as the expansion rate of the absorbent resin itself.

[0025] The SAP particles of this embodiment refer to a resin composition containing SAP in a granular form. The term "SAP-containing resin composition" as used herein includes both a composition consisting of SAP alone and a composition containing SAP as the main component and containing other substances to the extent that they do not adversely affect the water absorption. Examples of "other substances" include additives (such as surface modifiers added to make the particle surface hydrophobic) and unreacted monomers remaining during the synthesis of SAP.

[0026] The core wrap sheet 6W is a thin liquid-permeable sheet, and wrapping the absorbent core 6C with the core wrap sheet 6W makes it difficult for the SAP of the absorbent core 6C to be mixed with other structures. In addition, the absorbent core 6C is prevented from losing its shape. The core wrap sheet 6W can be made of pulp fiber, and tissue paper can be used as an example. The absorbent body 6 is wrapped in the back sheet 5 and the top sheet 7, and these sheets can also prevent the absorbent body 6 from losing its shape, so the core wrap sheet 6W may not be provided.

[0027] The three-dimensional gathers 3BL, 3BR formed by the side sheets 8L, 8R and the elastic members 8EL, 8ER are arranged along both ends in the width direction of the top sheet 7, and are arranged along the longitudinal direction of the diaper 1. The three-dimensional gathers 3BL, 3BR have joints 30L, 30R joined to the skin-facing side of the top sheet 7, and standing parts 31L, 31R standing from the joints 30L, 30R to the skin-facing side. The joints 30L, 30R are parts of the side sheets 8L, 8R joined to the top sheet 7 and the back sheet 5 or the cover sheet 4 on the outer side of the top sheet 7. A hot melt adhesive is used for joining these parts. The standing parts 31L, 31R are located on the inner side of the joints 30L, 30R in the width direction of the diaper 1, and stand to the skin-facing side by the contractile force of the elastic members 8EL, 8ER when the diaper 1 is worn. The boundaries between the joints 30L, 30R and the standing parts 31L, 31R are connected to the top sheet 7, and form standing lines 32L, 32R which are the starting points of the standing parts 31L, 31R. The standing portions 31L, 31R can rise toward the skin side across the standing lines 32L, 32R, which are the boundaries between the joints 30L, 30R and the standing portions 31L, 31R. In other words, the joints 30L, 30R are provided on the outer sides of the standing lines 32L, 32R in the width direction and are joined to the top sheet 7, while the inner sides in the width direction are not bonded and therefore rise from the top sheet 7 to form the standing portions 31L, 31R.

[0028] The distance between the standing lines 32L, 32R and the free ends of the three-dimensional gathers to which the elastic members 8EL, 8ER facing the said standing lines are attached is substantially the same throughout the entire area in which the three-dimensional gathers 3BL, 3BR are formed. Therefore, when the diaper 1 is worn, the three-dimensional gathers 3BL, 3BR rise at the same height in the front body region 1F, the crotch region 1B, and the back body region 1R and fit along the skin surface of the wearer.

[0029] The entire longitudinal ends of the standing parts 31L, 31R of the side sheets 8L, 8R are bonded to the top sheet 7 by a hot melt adhesive to form the fixed parts 33L, 33R. The joining parts 30L, 30R extend to the longitudinal ends of the side sheets 8L, 8R, so that the side sheets 8L, 8R are bonded to the top sheet over the entire longitudinal ends. The fixed parts 33L, 33R are present in the front body region 1F and the rear body region 1R, but at least one of them is provided at a position that does not overlap with the absorbent body 6. In the embodiment shown in FIG. 4, the fixed parts 33L, 33R do not overlap with the absorbent body 6 in both the front body region 1F and the rear body region 1R. The absorbent body 6 is thick because it is made up of multiple laminated absorbent mats, and if the fixing parts 33L, 33R are provided at the points where they overlap the absorbent body 6, the biasing force of the elastic members 8EL, 8ER is less likely to be transmitted to the fixing parts 33L, 33R. If the fixing parts 33L, 33R are provided at points where the absorbent body 6 does not extend, the fixing parts 33L, 33R will be more likely to follow the biasing force of the elastic members 8EL, 8ER.

[0030] In addition, the free end portions on the longitudinal outer side of the arrangement area of ​​the elastic members 8EL, 8ER can be left unattached to the top sheet 7 even in the fixing parts 33L, 33R. By not adhering the free end portions to the top sheet 7, the biasing force of the elastic members 8EL, 8ER is transmitted gently over the entire area of ​​the fixing parts 33L, 33R, and it is possible to prevent the biasing force of the elastic members 8EL, 8ER from concentrating on the longitudinal inner side of the fixing parts 33L, 33R.

[0031] 5 is a cross-sectional view of the front patch portion in the first embodiment. Specifically, it is a cross-sectional view cut in the width direction of the arrangement area of ​​the front patch 2F. Most of the front patch 2F is firmly bonded to the cover sheet 4 by an adhesive such as a hot melt adhesive to form a bonded area 2B. Meanwhile, at least a pair of non-bonded areas 2H, which are areas not bonded to the cover sheet 4, are arranged in the width direction on the outer side of the front patch 2F in the width direction. The non-bonded areas 2H extend in the longitudinal direction in the extension area of ​​the front patch 2F.

[0032] The widthwise end of the diaper 1 is folded when the diaper 1 is in a pre-use state, and the non-bonded region 2H corresponds to a crease formed by the folding line. The bonded region 2B is an example of a first bonded region in the present disclosure, and the non-bonded region 2H is an example of a first bonded region in the present disclosure. This is an example of a non-bonded region.

[0033] FIG. 6 is a schematic diagram showing an example of a protrusion formed on the front patch in the first embodiment. The front patch 2F is provided with a folding line that is convex on the non-skin side, and the non-bonded region 2H corresponds to the crease formed by the folding line. The front patch 2F is formed of a material with high rigidity in order to withstand repeated engagement and peeling of the hook tape 20. When the diaper 1 is worn, the rigidity of the front patch 2F causes the trace of the folding line formed on the front patch 2F to rise on the non-skin side, forming a protrusion 2P that is convex on the non-skin side. In the region corresponding to the folding line, the front patch 2F and the cover sheet 4 are not bonded to each other, forming the non-bonded region 2H, so that the protrusion 2P is greatly bent and may form a multi-stage protrusion.

[0034] At the protrusion 2P, for example, the front patch 2F is bent in a Z-shape, and the widthwise outer side of the protrusion 2P is located closer to the non-skin side than the widthwise inner side of the bent portion 2F1. That is, the front patch 2F in this embodiment has a step protruding toward the non-skin side at both ends of the widthwise outer side of the protrusion 2P. Even at the step, the loop structure on the non-skin side of the front patch 2F is maintained, and the hook tape 20 can be attached. On the other hand, the front patch 2F has a sufficient area to which the hook tape 20 can be attached, and in a normal use state, the hook tape 20 is attached to the widthwise inner side of the front patch 2F. Therefore, in a normal use state, the hook tape 20 is not attached to the protrusion 2P.

[0035] The hook tape 20, which is attached and fixed to the front patch 2F when worn, may peel off from the attachment site due to external force during wear. When the hook tape 20 peels off from the front patch 2F, the diaper 1 is no longer fixed around the wearer's waist, which may cause the diaper 1 to slip off or leak discharged liquid. In this case, the hook tape 20 is unlikely to move away from the wearer's body surface because it is restricted by clothing, bedding, etc., so the hook tape 20 mainly moves in the width direction along the wearer's body surface.

[0036] In the diaper 1 according to this embodiment, protrusions 2P are provided at both widthwise ends of the front patch 2F, and a step is formed on the front patch 2F at the widthwise outer side of the protrusions 2P, protruding toward the non-skin-facing side. The step portion is engageable with the hook portion of the hook tape 20. Therefore, even if the hook tape 20 is peeled off from the attachment position of the front patch 2F in the normal use state, the peeled hook tape 20 will engage with the protrusions 2P and the step portion formed on the widthwise outer side of the protrusions 2P as it moves outward in the width direction, and will stop.

[0037] In this way, in the diaper 1 according to the present embodiment, even if the hook tape 20 peels off from the front patch 2F, it engages with the protrusion 2P as it moves outward in the width direction and stops again, thereby preventing slipping off and leakage of discharged liquid. Note that the protrusion 2P may have multiple protrusions as shown in Fig. 6. Also, by providing multiple non-bonded regions 2H, multiple protrusions may be formed in the width direction, making it easier to arrange multiple pairs of protrusions.

[0038] <Second embodiment> Next, a second embodiment of the present invention will be described. In the following embodiment, the basic configuration and function of the diaper 1 are the same as those of the first embodiment. Therefore, in the diaper of this embodiment, elements having the same or corresponding functions or configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted.

[0039] Fig. 7 is a cross-sectional view of a front patch portion in the second embodiment. Specifically, similar to Fig. 5, it is a cross-sectional view of the arrangement area of ​​the front patch 2F cut in the width direction. In this embodiment, the front patch 2F is firmly bonded to the cover sheet 4 by an adhesive such as a hot melt adhesive applied to the entire extension area of ​​the front patch 2F. Therefore, there is no non-bonded area between the front patch 2F and the cover sheet 4 as in the first embodiment.

[0040] On the other hand, in the second embodiment, a non-bonded region 4CH is provided between the cover sheet 4 and the back sheet 5, where the layers of the two sheets are not bonded. In places other than the non-bonded region 4CH, the cover sheet 4 and the back sheet 5 are firmly bonded to each other to form a bonded region 4B. The non-bonded region 4CH is not limited to be provided between the cover sheet 4 and the back sheet 5. For example, when the cover sheet 4 has a two-layer structure consisting of the cover sheet 4 and an inner cover sheet, the non-bonded region 4CH may be formed between the cover sheet 4 and the inner cover sheet. The bonded region 4B is an example of the second bonded region in the present disclosure, and the non-bonded region 4CH is an example of the second non-bonded region in the present disclosure.

[0041] The non-bonded region 4CH extends to the longitudinal end of the diaper 1, and at least the longitudinal ends of the elastic members 4SL and 4SR extend in a natural state without exerting a contractile force toward the crotch region 1B. The longitudinal end of the elastic member 4C may also extend in the same position without exerting a contractile force. The elastic members 4C and the elastic members 4SL and 4SR may have stretchable ends on the crotch region 1B side of the non-bonded region 4CH. In other words, the non-bonded region 4CH is located in a range extending outward in the longitudinal direction from the stretchable ends.

[0042] The position of the non-bonded region 4CH relative to the extension range of the front patch 2F is the same as in the first embodiment, that is, the widthwise ends of the diaper 1 are folded before use, and the non-bonded region 4CH also overlaps the folding line.

[0043] 8 is a schematic diagram showing an example of a protrusion formed on the front patch in the second embodiment. The front patch 2F is provided with creases resulting from folding lines that protrude toward the non-skin side, and the non-bonded region 4CH also corresponds to the creases. The front patch 2F also has a strong rigidity. When the diaper 1 is worn, the rigidity of the front patch 2F causes the traces of the folding lines formed on the front patch 2F to rise toward the non-skin side, forming protrusions 2P2 that protrude toward the non-skin side.

[0044] In the second embodiment, protrusions 2P2 are provided at both widthwise ends of the front patch 2F, and a step protruding toward the non-skin side is formed on the widthwise outer side of the protrusions 2P2 in the front patch 2F. The step portion can be engaged with the hook portion of the hook tape 20, as in the first embodiment. Therefore, in the second embodiment, even if the hook tape 20 is peeled off from the attachment position in the normal use state of the front patch 2F, when the peeled hook tape 20 moves outward in the widthwise direction, it can be stopped by engaging with the protrusions 2P2 and the step portion formed on the widthwise outer side of the protrusions 2P2.

[0045] In the second embodiment, non-bonded regions 4CH provided between the back sheet 5 and the cover sheet 4 are used to form the protrusions 2P2. The non-bonded regions 4CH are non-bonded portions that are necessary in manufacturing to position the elastic members 4SL, 4SR at appropriate positions on the diaper 1, and also to position the elastic member 4C at an appropriate position when the joined ends of the elastic members 4SL, 4SR and the joined end of the elastic member 4C are overlapped. By overlapping the non-bonded regions 4CH with the folding lines of the diaper 1, the protrusions 2P2 can be formed by utilizing the structure required in manufacturing the diaper 1, without the need for a separate process of arranging a separate non-bonded region 2H between the cover sheet 4 and the front patch 2F as in the first embodiment. However, since the protruding portion 2P2 includes the cover sheet 4 having a certain rigidity in the protruding portion, it is smaller than the protruding portion 2P according to the first embodiment.

[0046] The non-bonded regions 4CH are non-bonded portions that are necessary in manufacturing to position the elastic members 4SL, 4SL and the elastic members 4C in appropriate positions when the bonded ends are overlapped. For this reason, the non-bonded regions 4CH are located not only on the front body region 1F side where the front patch 2F is present, but also on the back body region 1R side. On the back body region 1R side, there is provided a fastening member to which a hook tape 20 is bonded, which engages with the front patch 2F when the diaper 1 is worn. By engaging the front patch 2F with the hook tape 20, the diaper 1 is fixed around the waist and allowed to function properly.

[0047] Fig. 9 is an enlarged view of the width direction end of the rear body region of the diaper and the fastening member. The fastening member shown in Fig. 9 is any one of fastening members 2L1, 2L2, 2R1, and 2R2. The fastening member 2L1 will be described below as a representative of these, but the fastening members 2L1, 2L2, 2R1, and 2R2 all have the same shape and function and effect.

[0048] FIG. 9(A) is an enlarged view of the skin-facing side of any one of the fastening members 2L1, 2L2, 2R1, and 2R2 joined to the exterior body of the diaper 1. FIG. 9(B) is a cross-sectional view of any one of the fastening members 2L1, 2L2, 2R1, and 2R2 joined to the exterior body of the diaper 1 shown in FIG. 9(A). The fastening member 2L1 will be described below as a representative of these members, but the fastening members 2L1, 2L2, 2R1, and 2R2 all have the same shape and the same functional effects. The fastening member 2L1 is joined to the exterior body of the diaper 1 at its base. Side sheets 8L and 8R are arranged on the skin-facing side of the exterior body on the widthwise outer side of the rear body region 1R of the diaper. Since the fastening member described in this figure is the fastening member 2L1, the side sheet arranged on the skin-facing side is the side sheet 8L. The side sheets 8L, 8R also have a symmetrical configuration in the width direction, and the effects described below are similar to those of the side sheet 8R disposed on the side of the locking members 2R1, 2R2.

[0049] The base of the locking member 2L1 overlaps the exterior body, and is bonded to the sheet constituting the exterior body by an adhesive such as a hot melt adhesive to form a bonding region. In the vicinity of the bonding region with the locking member 2L1, the exterior body is composed of three layers of sheets, for example, as shown in FIG. 9(B), and a side sheet 8L is arranged on the skin-facing side. A back sheet 5 is arranged on the non-skin-facing side sandwiching the locking member 2L1. The locking member 2L1 is bonded to the side sheet 8L by applying an adhesive such as a hot melt adhesive to the skin-facing side of the base, and is bonded to the back sheet 5 by applying an adhesive such as a hot melt adhesive to the non-skin-facing side of the base. In the example shown in FIG. 5(B), a cover sheet 4 is further arranged on the non-skin-facing side of these sheets, and the cover sheet 4 is bonded to the back sheet 5.

[0050] In the example shown in FIG. 9, a non-bonded region 4CH where the side sheet 8L and the back sheet 5 are not bonded is provided so as to straddle the widthwise inner end of the base of the fastening member 2L1. The non-bonded region 4CH has a predetermined width and extends widthwise inward from the bonded region of the fastening member 2L1 and the outer body. For example, the width of the non-bonded region 4CH is 15 mm or more and 25 mm or less. The non-bonded region 4CH extends in the longitudinal direction of the diaper 1 and is provided in a position where the fastening member 2L1 is not present. For example, the non-bonded region 4CH extends to the longitudinal end of the diaper 1, and the longitudinal end of the elastic member 4C is disposed on the crotch region 1B side in a natural state where it does not exert a contractile force.

[0051] Even while the diaper 1 is being worn, the waist circumference of the wearer constantly changes due to abdominal movement caused by breathing, etc. Such changes may cause the waist circumference of the wearer to become narrower than when the fastening member 2L1 is attached to the front patch 2F. If the length is narrower, the outer body and the wearer's skin surface are likely to peel off toward the non-skin side, and the outer body that has peeled off toward the non-skin side pushes the fastening member 2L1 up toward the non-skin side, loosening the engagement between the fastening member 2L1 and the front patch 2F, which may lead to the diaper 1 being displaced. If a non-bonded region 4CH is provided in a region including the widthwise inner end of the diaper 1 at the base of the fastening member 2L1, deformation of the outer body caused by a temporary change in the wearer's waist length can be absorbed by the expansion and contraction of the non-bonded region 4CH. In the diaper 1 according to the first embodiment, deformation of the outer body is absorbed by the non-bonded region 4CH and is not transmitted to the fastening member 2L1, so that the engagement between the fastening member 2L1 and the front patch 2F does not loosen due to a temporary change in the waist length, and the diaper 1 can be maintained in a worn state.

[0052] Furthermore, since the non-bonded region 4CH extends in the longitudinal direction of the diaper 1 to a portion where the fastening member 2L1 is not present, deformation of the outer body is absorbed by the entire non-bonded region 4CH, including the portion where the fastening member 2L1 is not present, thereby further increasing the effect of not transmitting the deformation of the outer body to the fastening member 2L1.

[0053] Fig. 9(B) is a cross-sectional view of the widthwise end of the rear body region and the fastening member. In the example shown in Fig. 6, the base of the fastening member 2L1 is entirely covered by the side sheet 8L and the back sheet 5. The non-bonded region 4CH is disposed between the back sheet 5 and the cover sheet 4. The non-bonded region 4CH easily bends to form a space when necessary, and the deformation of the space absorbs various forces applied to the diaper 1, making it easier to maintain the diaper in a worn state.

[0054] In this way, the non-bonded regions 4CH provided on the front body region 1F side and the back body region 1R side exert a synergistic effect. That is, the non-bonded region 4CH provided on the back body region 1R side reduces the force applied to the fastening member 2L1 while the diaper 1 is being worn, making it difficult for the fastening member 2L1 to come off from the front patch 2F. The non-bonded region 4CH provided on the front body region 1F side forms the protrusion 2P2 with which the hook tape that comes off and moves outward in the width direction can be re-engaged when the hook tape that is joined to the fastening member 2L1 comes off from the front patch 2F. This synergistic effect makes it possible to realize a diaper 1 that can appropriately absorb the force applied to the side of the body and is difficult to come off.

[0055] <Third embodiment> Next, the third embodiment of the present invention will be described. FIG. 10 is a cross-sectional view of the front patch portion in the third embodiment. Specifically, as in FIG. 5, it is a cross-sectional view of the arrangement area of ​​the front patch 2F cut in the width direction. In the third embodiment, the front patch 2F is firmly bonded to the cover sheet 4 by an adhesive such as a hot melt adhesive applied to the entire extension area. Therefore, there is no non-bonded area between the front patch 2F and the cover sheet 4 as in the first embodiment. In addition, the back sheet 5 and the cover sheet 4 are also firmly bonded by an adhesive such as a hot melt adhesive, so there is no non-bonded area as in the second embodiment.

[0056] Even in this case, the diaper 1 is folded before use, and the front patch 2F has creases formed by folding lines that are convex on the non-skin side, so that when the front patch 2F is in use, creases that are traces of the folding lines remain on the front patch 2F, and these creases function as protrusions 2P3 that are convex on the non-skin side. Even if the hook tape 20 is peeled off from the attachment position of the front patch 2F in the normal use state, as the peeled hook tape moves outward in the width direction, it can be stopped by engaging with the step portion formed on the outer side of the protrusions 2P3 in the width direction.

[0057] In the third embodiment, the protrusion 2P3 is larger than the protrusions 2P and 2P2 according to the other embodiments. However, the protrusions 2P3 can be formed without any processing of the diaper 1. The hook tape 20 that has been peeled off from the attachment position also engages with the protrusions 2P3, making it possible to prevent the diaper 1 from slipping down.

[0058] Although the present embodiment has been described above, the contents of the present invention are not limited to the above embodiment. For example, the hook tape 20 shown in each embodiment is flat, but it may be a shallow dish shape with the outer edge bent toward the skin side. By doing so, when the locking member is peeled off from the front patch 2F, the protrusion on the front patch 2F side and the edge on the hook tape 20 side can be easily re-engaged, which is preferable.

[0059] The embodiments and application examples thereof disclosed above can be combined with each other. [Explanation of symbols]

[0060] 1. Diapers 1B...Inseam area 1F: Front body area 1R: Back body area 2B,4B··Joint area 2F: Front patch 2F1...Bending part 2H,4CH··Non-bonded area 2L1,2L2,2R1,2R2...Locking member 2P,2P2,2P3...Protrusion 3AL, 3AR Leg Gathers 3BL, 3BR: 3D gathers 3R: Waist gather 30L,30R·Joint part 31L,30R・Standing part 32L, 32R · Standing line 33L,33R・Fixed part 4. Cover sheet 4KL, 4KR... Constriction 4C, 4SL, 4SR, 8EL, 8ER, 9ER, 22, 24 Elastic member 5. Back sheet 6. Absorber 6C··Absorbent core 6A··Upper layer absorbent mat 6B··Lower layer absorbent mat 6W··Core wrap sheet 6T··Convex part 7. Top sheet 8. Side seat 10L, 10R: Leg area 20 Hook tape

Claims

1. A length along a longitudinal direction, a length along a width direction perpendicular to the longitudinal direction, a front body region facing the wearer's abdomen, a rear body region facing the wearer's back, and a crotch region located between the front body region and the rear body region and in which an absorbent is disposed; an exterior covering that covers at least the crotch region and the outer side and non-skin facing side of the absorbent body in the width direction of the front body region; a fastening member protruding from an end portion in the width direction of the rear body region and having a hook tape of a hook-and-loop fastener joined to its skin-facing side; a first bonded region bonded to the exterior body on the non-skin facing side of the front body region, a first non-bonded region extending in the longitudinal direction and not bonded to the exterior body, and a front patch having a recessed material or a loop member with which the hook tape can be repeatedly engaged, the recessed material or loop member extending in the longitudinal direction in the first non-bonded region and having a fold at a central portion thereof that is convex toward the non-skin facing side; An absorbent article comprising:

2. A length along a longitudinal direction, a length along a width direction perpendicular to the longitudinal direction, a front body region facing the wearer's abdomen, a rear body region facing the wearer's back, and a crotch region located between the front body region and the rear body region and in which an absorbent is disposed; an exterior body including a second bonded region that covers at least the crotch region and the front body region of the absorbent body in the width direction and the non-skin side, and is bonded to the skin side structure at an interlayer thereof, and a second non-bonded region that extends in the longitudinal direction and is not bonded to the skin side structure at an interlayer thereof; a fastening member protruding from an end portion in the width direction of the rear body region and having a hook tape of a hook-and-loop fastener joined to its skin-facing side; a front patch having a recessed or loop member with which the hook tape can be repeatedly engaged, the front patch extending in the longitudinal direction in the second non-bonded region, the central portion of which is provided with a convex fold on the non-skin facing side, and bonded to the non-skin facing side of the front body region; An absorbent article comprising:

3. A length along a longitudinal direction, a length along a width direction perpendicular to the longitudinal direction, a front body region facing the wearer's abdomen, a rear body region facing the wearer's back, and a crotch region located between the front body region and the rear body region and in which an absorbent is disposed; an exterior covering that covers at least the crotch region and the outer side and non-skin facing side of the absorbent body in the width direction of the front body region; a fastening member protruding from an end portion in the width direction of the rear body region and having a hook tape of a hook-and-loop fastener joined to its skin-facing side; a front patch joined to the exterior body on the non-skin facing side of the front body region, extending in the longitudinal direction, with a central portion having a convex fold on the non-skin facing side, the front patch having a recessed member or a loop member with which the hook tape can be repeatedly engaged; An absorbent article comprising:

4. At least one pair of the folds are arranged in the extension region of the front patch. An absorbent article according to any one of claims 1 to 3.

5. The folds are arranged in pairs. The absorbent article of claim 4.

6. The fold is disposed near an end portion of the front patch in the width direction. The absorbent article of claim 4.

7. The second non-bonded region is also provided at a position overlapping with a base portion of the locking member in the longitudinal direction. The absorbent article of claim 2.

8. a first elastic member disposed in a stretched state in the longitudinal direction on the outer side of the end portion in the width direction of the absorbent body, the stretch end being an end portion of the extension region of the first elastic member overlapping with the front patch; The second non-bonded region is disposed in a range obtained by extending the position of the stretchable end outward in the longitudinal direction. The absorbent article of claim 2.

9. a second elastic member that is arranged wide in the front body region and the back body region, arranged narrow in the crotch region, curved inward in the width direction from the outer side in the longitudinal direction to the crotch region, and arranged in a stretched state in the longitudinal direction so as to overlap with the absorbent body in the thickness direction in the crotch region, and has an elastic end that does not overlap with the absorbent body; The first elastic member and the second elastic member overlap each other at the stretchable end. The absorbent article of claim 8.

Images